JPH0338057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is used in a device for handling small components using a suction nozzle, such as a chip-shaped electronic component mounting device in an electronic circuit mounting process.

(b) Conventional technology Chip-shaped electronic components are normally sucked into a suction nozzle and transported to a board. Adhesive or paste-like solder is applied to the board, and components are pressed onto this.In order to accurately place the components in the desired location, the components must be pressed while the components are being sucked into the suction nozzle. It is necessary to align the center of the camera to the correct position. Therefore, the component sucked by the suction nozzle is held between correcting claws to correct the positional deviation. The device proposed by the applicant in Patent Application No. 174514 of 1982 (see Japanese Patent Application Laid-Open No. 60-67089) is also used for this purpose.

In the above-mentioned proposed device, the correcting claws supported on the rotary disk are moved in the centripetal or centrifugal direction by a cam, but the following problems occurred in the actual device. This will be explained with reference to FIG. 12 and the following drawings. In FIG. 12, 101 is a component, 102 is a suction nozzle, 1
03 is a straightening claw, 104 is a slider that supports the straightening claw 103, 105 is a cam follower hanging from the slider 104, 106 is a roller pivotally supported at the lower end of the cam follower 105, 107 is a conical cam surface 108 that contacts the roller 106 It is a wedge-shaped cam that allows The slider 104 is biased in the centripetal direction by a spring (not shown), and moves in the centripetal direction when the cam 107 descends, and moves in the centrifugal direction when the cam 107 rises. A slide guide 109 supports the slider 104. Slide guide 109
Although any type of commercially available linear motion bearing can be used, the one shown in the figure has multiple rollers 1
10 is interposed therebetween. As can be seen in FIGS. 13 and 14, the rollers 110 are arranged with their axes tilted in alternate directions by 45 degrees with respect to the vertical direction. The structure is designed to support the load of . The slider 104 moves the cam 10 with the roller 106 at the tip of the long cam follower 105.
7, the V-shaped groove 111 that receives the roller 110 is in a shape that supports rotational moment, and only the shaded areas in FIG. 14 at both ends of the V-shaped groove 111 are intensively worn. This causes play in the mechanism, resulting in poor positioning accuracy, and also causes problems in that the roller 110 falls into a recess created by wear, resulting in poor movement of the slider 107.

(C) Problems to be Solved by the Invention The present invention positions parts attracted to a suction nozzle using a correction claw supported on a rotary disk so as to be movable in a centripetal direction or a centrifugal direction.
The correcting claw drive structure has been improved so that the correcting claw supporting means can exhibit the desired performance over a long period of time.

(G) Means for Solving the Problems In the present invention, one or more pairs of sliders supporting correction claws are supported on a rotary disk rotating around a vertical axis so as to be movable in a centripetal direction or a centrifugal direction.
A cam is placed below the rotary disk. A cam follower is provided that converts the movement of the cam into centripetal or centrifugal movement with respect to the rotary disk axis, and a transmission piece that reaches the same height level as the slider is fixed to the cam follower. An engaging body protruding from the slider is engaged with this transmission piece. The rotary disk shall be stopped at index positions at predetermined intervals, and the cam follower shall be placed between the two index positions. The transmission piece is
It extends in an arc shape along the outer periphery of the rotary disk, spanning the index positions on both sides of the cam follower.

(e) Action The acting force of the cam is transmitted to the slider via the cam follower and the transmission piece, but since the transmission piece is connected to the slider at the same height level as the slider and transmits the force, it is not strong enough to cause uneven wear. No moment is created on the slider. Therefore, the slider continues to move smoothly for a long period of time without being disturbed by local wear. Furthermore, since one transmission piece covers two index positions, the number of cam followers and transmission pieces can be smaller than the number of indexes.

(F) Embodiment An embodiment will be described based on FIGS. 1 to 11. The main part of the positioning device 1 is a circular rotary disk 2, which is supported by rollers 3 so as to be rotatable around a vertical axis. Roller 3 is
Three of them are arranged at 120° intervals, and each is pivotally supported on a base 4, which is an immovable member. Reference numeral 5 denotes an electric motor supported by a base 4, which connects a pulley 6 at the end of the shaft and the rotary disk 2 with a belt 7, and rotates the rotary disk 2 through a required angle.

The rotary disk 2 has four correction claws 8a, 8b, 9a,
Place 9b at 90° intervals. Slider 40a, 4
0b, 41a, and 41b support each correction claw. As shown in FIG. 3, sliders 40a, 40b, 4
1a and 41b are one pair of slide guides 10,
10, and is movable in the centripetal direction or centrifugal direction with respect to the center of the rotary disk 2. Correction nails 8a, 8b
holds the long sides of the part 11, and the correcting claws 9a and 9b hold the short sides of the same part 11. The component 11 is attracted by a suction nozzle 12 supported on an index table or the like and is carried between the correction claws. A shaft 13 is vertically fixed to the center of the rotary disk 2, and pinions 14 and 15 are rotatably supported on the outside thereof. Racks 16 fixed to sliders 41a and 41b engage with the upper pinion 14 from both sides, and racks 17 fixed to sliders 40a and 40b engage with the lower pinion 15 from both sides. Each slider has one leg depending downwardly, and the rack is fixed to this leg. Each slider also has a tension coil spring 2 stretched between it and the rotary disk 2.
0,21 (FIG. 7), it is energized in the centripetal direction. The spring 21 that urges the sliders 41a and 41b is the spring 2 that urges the sliders 40a and 40b.
Stronger than 0. The pinions 14 and 15 are each provided with a notch having an angle of just over 180 degrees, and the remaining fan-shaped protrusions are engaged as engagement portions 22 and 23 (FIG. 8) for transmitting rotation. Reference numeral 24 denotes a back-up pin that projects upward from inside the shaft 13, and, as shown in FIG. 11, can move up and down with respect to the shaft 13, and is pushed up to the highest position by a spring 25. This back-up pin 24 is connected to the component 11 that is sucked by the suction nozzle 12 and descends.
This prevents the part 11 from falling off due to inertia when it stops descending.

26 is a wedge-shaped cam arranged below the rotary disk 2 so as to be located on the axis of the rotary disk 2. The cam 26 has a truncated conical outer shape, and the shaft 13 is attached to the top surface.
A recess 27 is formed for receiving the lower end of. The cam 26 is fixed to the upper end of the vertical shaft 28. This vertical shaft 28 is given vertical movement by a cam (not shown).

A slide guide 29 is fixed to the side surface of the base 4 at a location almost directly beside the cam 26. The slide guide 29 supports the cam follower 30a so that it can move horizontally, that is, within a plane perpendicular to the axis of the rotary disk 2. Cam follower 30a
is aligned with the cam 26 in the plane, and is drawn toward the base 4 by the spring 31, bringing the roller 32 at one end into contact with the cam 26, and the reciprocating motion of the cam 26 is controlled by the rotary disk 2.
converts into centripetal or centrifugal motion relative to the axis of

As shown in FIG. 3, the rotary disk 2 has a total of eight index positions A, B, C,
Stop at D, E, F, G, H. However, this does not mean that the rotary disk 2 rotates in steps of 45 degrees;
Sometimes rotations of 90° or 180° occur at one time.
The cam follower 30a is located between index positions G and H,
They are placed 22.5 degrees apart from each other.
A transmission piece 33a is fixed to the upper surface of this cam follower 30. The transmission piece 33a approaches the rotary disk 2, and at its end, a rising portion 34a that draws an arc concentric with the rotary disk 2 is connected to the slider 41.
It reaches the same height as a and 41b, and the cam follower 3
Rotary disk 2 straddles index positions G and H on both sides of 0a.
It extends in an arc along the outer periphery of the. The ends of the rising portions 34a slightly protrude from the index positions G and H.
Correspondingly, extension pieces 35a and 35b are fixed to the outer ends of the sliders 41a and 41b. At the tips of the extension pieces 35a, 35b, sliders 41a,
A roller-shaped engaging body 36 that engages with the outer surface of the rising portion 34a on an extension of the linear movement path of the roller 41b.
is supported for rotation about a vertical axis. Another set of slide guides is fixed to the side surface of the base 4 at a position separated by 90 degrees from the slide guide 29 in a planar positional relationship. In the example,
It will be placed between index positions E and F. A cam follower having the same structure as the cam follower 30a is supported by this, and a transmission piece 33b similar to the transmission piece 33a is made to protrude therefrom. Transmission piece 33b
has a rising portion 34b having the same curvature as the rising portion 34a, and this rising portion 34b extends beyond the index positions E and F. Adjacent ends of the rising portions 34a and 34b overlap vertically as shown in FIG. 4, so that the roller 36 can smoothly move from the rising portion 34a to the rising portion 34b or vice versa.
Further, the angle between the rising portions 34a and 34b from one end to the other reaches 180° or more. This allows extension piece 3
Once both of the rollers 35 and 36 of the rollers 5a and 35b are engaged with the rising portions 34a and 34b, one of them is disengaged, and switching between engagement and disengagement is smoothly performed.

The positioning device 1 operates as follows. In the figure, the rotary disk 2 has the slider 41a located at the index position G. The cam 26 is initially in the raised position, the cam follower 30a is pushed away in the centrifugal direction, the transmission piece 33a pulls the slider 41a,
The slider 41a and the slider 41b connected thereto via the pinion 14 are moved in the centrifugal direction. This movement is performed by moving the slider 4 in the order of rack 16 → pinion 14 → pinion 15 → rack 17.
0a, 40b, and the sliders 40a, 40
b also opens in the centrifugal direction. Here, the correction nails 8a, 8
Part 11 is inserted between b, 9a and 9b (FIG. 8). Next, as the cam 26 is lowered, each correction claw begins to move in the centripetal direction. First, the part 11 is held between the pair of correcting claws 8a and 8b, which are energized by the weaker spring 21 (FIG. 9). Since the straightening claws 8a and 8b are connected via the rack 17 and the pinion 15, the component 11 can be reliably moved to the center. The movement of the correcting claws 8a, 8b in the centripetal direction stops here, but the correcting claws 9a, 9b continue to move in the centripetal direction. This is possible because there is a gap between the engaging portions 22 and 23 of the pinions 14 and 15 in the rotational direction. Eventually, the correction claws 9a, 9b also reach the component 11, and the correction claws 8a,
The part 11 held between the parts 8b is positioned by the force of the strong spring 20 (FIG. 10). If it is also necessary to adjust the angle of the component 11 with respect to the suction nozzle 12,
The rotary disk 2 is rotated by a predetermined angle by an electric motor 5.
After this, the cam 26 rises again, and each correction pawl
1 and the suction nozzle 12 carries away the part 11. The transmission piece 33a also performs the above operation for the slider stopped at the indexed position H. Transmission piece 33b
The same operation is performed for the sliders stopped at index positions E and F. Therefore, the part 11 to be positioned
Parts 1 for pick-up or positioning
1, no matter which index position the rotary disk 2 attempts to stop at, the two transmission pieces 33a, 33
b allows the desired operation to be performed.

(G) Effects of the invention When installing a slider supporting correction claws that sandwich parts on a rotary disk, due to space constraints and the pursuit of weight reduction, the slider and its support mechanism must be large-sized with a large load capacity. cannot be used. However, according to the present invention, since no moment that would cause local wear is applied to the slider, abnormalities are less likely to occur around the slider even if the structure has a small load capacity. On the other hand, since the cam follower and the transmission piece are located outside the rotary disk, they can be supported with a strong support structure with a large load capacity, and as a result, the device as a whole is highly reliable and has fewer failures. I can do it. Furthermore, although the rotary disk is stopped at multiple index positions, since multiple index positions are covered by one transmission piece, the number of transmission pieces and therefore cam followers can be reduced, making the configuration unnecessarily complicated. can be avoided from becoming

[Brief explanation of drawings]

Figures 1 to 11 show an embodiment of the present invention, Figures 1 and 2 are sectional views of different operating states, Figure 3 is a top view of the rotary disk, and Figure 4 is a side view of the transmission piece. Developed view, FIGS. 5 and 6 are planar layout diagrams of the rack and pinion for opening and closing the correction claw, FIG. 7 is a bottom view of the rotary disk, FIGS. FIG. 11 is a partially enlarged sectional view showing the configuration of the backup pin. Figure 12 and subsequent figures are diagrams for explaining the problems of the conventional structure. Figure 12 is a front view, Figure 13 is a partial sectional view, Figure 14 is an inner view of the slide guide, and Figure 15 is an enlarged view of the slider. FIG. 2... Turntable, 40a, 40b, 41a, 41
b...Slider, 8a, 8b, 9a, 9b...Correction claw, 11...Parts, 12...Suction nozzle, 26
...Cam, 30a...Cam follower, 33a, 3
3b...transmission piece, 36...engaging body, A, B, C,
D, E, F, G, H... Index position.

Claims (1)

[Claims] 1. A rotary disk that rotates around a vertical axis; one or more pairs of sliders supported on the rotary disk so as to be movable in a centripetal direction or a centrifugal direction; A straightening claw that positions the component by pinching the component to be sucked; a cam disposed below the rotary disk; and converting the movement of the cam into a centripetal or centrifugal motion with respect to the rotary disk axis. a cam follower, a transmission piece fixed to the cam follower and having a height level equivalent to that of the slider, and an engaging body protruding from the slider and engaging with the transmission piece, and the rotary disk is indexed at predetermined intervals. The cam follower is placed between the two index positions, and the transmission piece extends in an arc along the outer periphery of the rotary disk, spanning the index positions on both sides of the cam follower. A parts positioning device characterized by: